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340161-32-2

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340161-32-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 340161-32-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,0,1,6 and 1 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 340161-32:
(8*3)+(7*4)+(6*0)+(5*1)+(4*6)+(3*1)+(2*3)+(1*2)=92
92 % 10 = 2
So 340161-32-2 is a valid CAS Registry Number.

340161-32-2Downstream Products

340161-32-2Relevant articles and documents

Chiral lithium amido sulfide ligands for asymmetric addition reactions of alkyllithium reagents to aldehydes

Granander, Johan,Sott, Richard,Hilmersson, Goeran

, p. 439 - 447 (2007/10/03)

Six chiral amino sulfides have been synthesised from the amino acids phenylalanine, phenylglycine and valine. These amino sulfides were used as chiral ligands in the asymmetric addition of n-butyllithium and metyllithium to various aldehydes at low temperatures. The highest stereoselectivities were obtained with benzaldehyde, resulting in 1-phenyl-1-pentanol and 1-phenyl-1-ethanol in enantiomeric excesses of >98.5 and 95%, respectively. These stereoselectivities were significantly higher than those induced by the ether analogues.

New chiral auxiliaries for the construction of quaternary stereocenters by copper-catalyzed Michael reactions

Christoffers, Jens,Mann, Alexander

, p. 2752 - 2754 (2007/10/03)

The construction of quaternary stereocenters with 95-99% ee at ambient temperatures can be achieved by a copper-catalyzed Michael reaction with the application of α-amino acid amides as chiral auxiliaries [Eq. (1)]. These amides can be obtained in a few steps from the α-amino acids with standard transformations and, after the Michael reaction, they can be quantitatively recovered. Exclusion of water and oxygen is not necessary.

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